Punch press



July 14, 1925. 1,546,298

- T. w. MCGRATH PUNCH PRESS Filed March 11. 1925 INVENTOR ATTORNEYSPatented July 14, 1925.

UNITED STATES THOMAS WILLIAM MCGRATH, 0F HARTFORD, CONNECTICUT.

PUNCH PRESS.

To all whom it may concern:

Be it known that I, THOMAS WILLIAM MGGRATH, a citizen of the UnitedStates, and a resident of Hartford, in the county of Hartford and Stateof Connecticut, have invented certain new and useful Improve ments inPunch Presses, of which the following is a specification.

This invention relates to a safety device for use with punch presses orthe like and aims to provide a device of this character whereby the handof the operator will be positively and quickly withdrawn from beneaththe ram of the press when the ram begins to descend.

A further object is to provide a safety device of this character whichis equally well adapted for use with either right or left hand work orfor both hands.

Another object resides in the provision of a safety device of thischaracter which is of simple and durable construction, reliable andeffective in operation and easy and comparatively inexpensive tomanufacture and apply- Other objects and advantages reside 1n certainnovel features of the construction, arrangement and combination of partswhich will be hereinafter more fully described and particularly pointedout in the appended claims, reference being had to the accompanyingdrawings forming a part of this specification, and in which:

Figure 1 is a perspective view showing the invention applied to a press,and

Figure 2 is a view in section on line 22 of Figure 1.

Referring to the drawings, the numeral 1 designates generally a punchpress which has the usual ram 2.

The safety device which constitutes the present invention includes anoperating bar 3 secured as at 4. to the ram 2 and having an inclinedportion 5 adjacent its lower end. The inclined portion 5 of the bar 3 iscooperable with the short arm 6 of a lever designated generally at 7 andfulcrumed on the press as at 8. The lever 6 has a long arm 9 which ispivoted to one end of a link 10. The other end of the link 10 is pivotedto the short arm 11 of a second lever 12 which is longer than the lever7. The second lever 12 also has a long arm 13 and is also fulcrumed tothe punch press as indicated at 1 1. A strap 15 is connected to thefor,-v War a d; a? the le s e 13 25 t level? 2 Application filed March11, 1925. Serial No. 14,762. Y

and is adapted to be secured to the wrist or hand of the operator. Thefulcrums 8 and 14 of the levers 7 and 12 are vertical pivots on suitablebrackets so that these levers swing in a horizontal plane. It is to beunderstood that the device may be mounted or fulcrumed on either side ofthe press so as to be used for either right or left hand work.

With this arrangement when the ram 2 starts to descend the inclinedportion 5 of the operating bar 3 engages the short arm 6 of the lever 7and swings the lever about its fulcrum. The motion of the lever 7 istransmitted to the strap 15 through the link 10 and lever 12 and ismultiplied so that the hand of the operator is withdrawn from beneaththe ram at the beginning of its descent.

By means of this simple and comparatively lnexpenswe arrangement whichdoes not require any alteration of the punch press structure the dangerof injury to the operator is practically eliminated even though theoperator be less alert than he should be. The device withdraws the handof the operator before it is liable to be injured or crushed.

I claim:

1. A safety device for use with punch presses or the like comprising avertical operating bar connected with the ram of the press and having aninclined portion, a lever fulcrumed on the press and engaged by thelnclined portion of the bar, a second lever connected with the firstlever, and a strap connected to the second lever and adapted t o besecured to the wrist or hand of the operator.

2. A safety device for use with punch presses or the like comprising avertical operating bar connected with the ram of the press and having aninclined portion, a lever fulcrumed on the press and having a short armengageable with the bar, a second lever, fulcrumed on the press andhaving a short arm connected with the long arm of the first lever, thelong arm of the second lever being adapted to move the hand of theoperator out from beneath the ram.

3. A safety device for use with punch presses or the like comprising avertical operating bar connected with the ram of the press and having aninclined portion, a lever me an the pre and tame a sh r a e e eabla ththe be; a l

lever, and a strap connected to the longerm of the second lever-anda-clapted to be secured to the Wrist or hand of the operator.

4. A safety device for use With punch presses or the like comprising alever having a long arm and a, short arm, a second lever also having along arm and a, short arm, a

operator.

connecting link between the long "of the first lever and the short armof the second lever, means cooperable with the short armof=tl1efirst-:l:ever for actuating the first lever and consequently thesecond lever When the [press is operated and means for connecting 15 thelong arm of the second lever With the THOMAS WILLIAM MCGRATH.

